ELECTRICAL CHARACTERISTICS (Voltages referenced to Vss) (Con’t)

Characteristic

Unit Condition

Min

Max

Min

Max

Min

Max

Switching Characteristics (See Fig. 3)

3.0

-

1.8

-

1.4

-

1.05

MHz

RC Oscillator Frequency

10.0

-

4.5

-

3.4

-

2.6

MHz -

18.0

-

8.0

-

4.0

-

3.0

MHz

3.0

-

2.6

-

2.0

-

1.52

MHz For prescale

External Clock or

10.0

-

5.3

-

4.0

-

3.0

MHz factor S = 1 or 3000

Crystal Oscillator

18.0

-

5.9

-

4.6

-

3.5

MHz or 3600

Frequency

3.0

-

7.2

-

5.5

-

4.2

MHz S = 32768

10.0

-

16.0

-

12.8

-

9.7

MHz or

18.0

-

15.9

-

12

-

9.1

MHz 32768 x 60

TRIG Set-Up Time

-

38

-

50

-

66

-

ns

-

A, B Set-Up Time

-

0

-

0

-

0

-

ns

-

3.0

-

284

-

375

-

495

ns

Clock to Out Delay

10.0

-

98

-

130

-

172

ns

18.0

-

87

-

115

-

152

ns

7215-062309-4

A 1

2

B

TRIG 19

CLOCK/RC/XTLI 4

XTLO (LS7216)

5

6

PSCLS

1M

1M

OSC

MUX

3-STATE

DECODER

CLOCK

LATCH

EDGE

DETECT

MODE

REG

LATCH/TIMER

PRESCALER

500k

8

CONTROL

LOGIC

BUF

9 OUT

500k

500k

500k

WB7-WB0

500k (8)

+V

+V

+V

RCS/CLKS (LS7215)

7

RESET

500k

+V

-V

LATCH

8

8

8

LOAD

20

3

8

11-18

ODOUT

10

5